Eat Your Greens: The Surprising Power of Home Grown Leaf Crops
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About this ebook
Turn over a new leaf with these nutritional powerhouses for your kitchen garden
Our industrialized food system is failing us, and as individuals we must take more responsibility for our own health and food security. Leaf crops produce more nutrients per square foot of growing space and per day of growing season than any other crops and are especially high in vitamins and minerals commonly lacking in the North American diet. As hardy as they are versatile, these beautiful leafy vegetables range from the familiar to the exotic. Some part of this largely untapped food resource can thrive in almost any situation.
Eat Your Greens provides complete instructions for incorporating these nutritional powerhouses into any kitchen garden. This innovative guide:
- Shows how familiar garden plants such as sweet potato, okra, beans, peas, and pumpkin can be grown to provide both nourishing leaves and other calorie- and protein-rich foods
- Introduces a variety of non-traditional, readily adaptable alternatives such as chaya, moringa, toon, and wolfberry
- Explains how to improve your soil while getting plenty of vegetables by growing edible cover crops
Beginning with a comprehensive overview of modern commercial agriculture and rounded out by a selection of advanced techniques to maximize, preserve, and prepare your harvest, Eat Your Greens is an invaluable addition to the library of any gardening enthusiast.
David Kennedy is the founder and director of Leaf for Life, a nonprofit organization dedicated to the elimination of global malnutrition through the optimum use of leaf crops, and is the author of 21st Century Greens and the Leaf for Life Handbook.
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Eat Your Greens - David Kennedy
PART I
Balancing Our Food System
1
Two Out of Three Cheers
The Power of the Industrial Food System
Most food in North America is supplied through a global industrialized network. Food produced and distributed through that industrial system is cheaper now than it has ever been in human history. Just 15 minutes, working at the US minimal wage, can earn the money needed to buy enough food to meet a person’s daily requirements for calories and protein. Of course, this would not be gourmet dining, and not everyone has a job, even a minimum wage one. There are numerous other problems, including high housing, medical, and transportation costs, as well as the usual spectrum of social, emotional, and educational factors that can keep a person from getting the food they need. However, the high cost of basic foods isn’t one of them.
In 2011 Americans spent less than ten percent of their disposable income on food, and nearly half of that was spent eating away from home. Sixty years earlier, food made up nearly a quarter of the entire household budget in the US. This is about the same percentage that Mexicans now spend. In many countries, such as Pakistan and Kenya, half of all income goes to buy food. Despite the increasing productivity of industrial agriculture, the appallingly unequal distribution of the world’s resources results in roughly one billion people still falling asleep hungry most nights. Few of them live in North America.
It is not simply a plentiful supply of staple foods that North Americans enjoy. Food remains cheap even as we eat our way up the food chain. As people used to say, we eat high on the hog.
That is, we eat a lot of luxury foods with high nutritional value, especially meat, fish, milk, and eggs. These foods of animal origin require greater resources to produce than plant-based foods and, as a result, they are almost invariably more expensive. Still, North Americans generally have enough income to fully indulge their taste for animal-based foods. In fact, only the half million people living in tiny Luxembourg eat more meat than Americans.
Our food prices may fluctuate a bit from year to year, but even through droughts, freezes, floods, and wars, we have a reliable supply of nutritious food. This dependable source of nourishment affords even average citizens luxuries like pursuing higher education, diverse careers, and the arts. The constant availability and low cost of food is so central to our modern way of life that it is easy to take it for granted.
Food Systems
There are basically four interconnected parts to any food system: production, processing, distribution, and consumption.
Production
The vast bulk of our food begins as wide swaths of single crops growing in neat rows on huge farms. Growing large areas dedicated to a single variety of plant is known as monoculture or monocropping. In North America, corn and soy are by far the most dominant of our food crops — in both acreage and sales — followed by wheat. Farmers growing these monoculture crops have tried to remain profitable chiefly by increasing yields while decreasing their labor costs.
Crop yields, especially of corn and soy, have climbed steadily over the past 80 years, primarily through the increased use of soluble fertilizers, irrigation, and specially bred seeds. During this same time, herbicides and insecticides were also introduced. By reducing competition from weeds and insects, they allowed much more food to mature and reach the market. The combination of these techniques has led to per acre corn yields six time greater than what they were in 1931. Similar, if not quite as dramatic, improvements were made in the yields of other food crops.
Agricultural labor costs have been minimized by some of the same techniques that increased yields. Using concentrated fertilizers to stimulate growth and replace lost soil nutrients requires far fewer hours of work than maintaining soil fertility with animal manures and cover crops. Spraying herbicides to control weeds takes far less time and sweat than repeatedly hoeing them by hand or even cultivating them with a tractor. The labor required to control weeds has recently been even further reduced by the introduction of seed that has been genetically modified to survive specific herbicides. Nearly 90 percent of all corn and soy in the US is now grown from genetically modified (GM) seed, and most of it has been engineered for herbicide resistance.
During the same time that per acre corn yields jumped six-fold, the average farm size in the US nearly tripled — to 418 acres. Canadian farms grew, too, to an average of 778 acres. With two and a half times as much land to tend, farmers turned to bigger machinery to keep their labor costs low. Taken together, this combination of larger farms, bigger machinery, concentrated fertilizers, herbicides and pesticides, irrigation, and improved seed has made the North American farmer incredibly productive. Today’s farmer can produce as much food in four hours as his counterpart in 1950 produced in a 48-hour work week. This amazing 12-fold leap in labor productivity underlies much of our modern food system.
Coinciding with the explosion in corn and soy yields came a transformation in raising livestock. Concentrated or Confined Animal Feeding Operations (CAFOs) began in the 1950s as a new way to raise poultry more profitably. Large numbers of animals were fed in confined areas where their movement was very limited. Adapting the strategy of the assembly line, the CAFOs scaled up, streamlined, and mechanized the process of raising farm animals. This allowed them to speed production, create a more uniform product, and simplify processing and sales — all while sharply reducing labor costs.
The principles of factory livestock farming were soon extended to cattle and swine, and even to raising fish. The US produces roughly the same amount of pork as it did in 1950, but just eight percent as many farms are needed to match that output now that the CAFO model is dominant. Despite some consumer resistance, the bulk of our meat and eggs is now produced with this method. Because the confined animals are not able to forage or graze for any of their food, everything they eat needs to be brought to them. All of the different types of animals are fed concentrated diets comprised mainly of corn and soy. Thus the success of the CAFO model depends upon an enormous and cheap supply of those two field crops.
Processing
The mountains of corn, soy, and wheat and the enormous herds and flocks of cattle, pigs, and poultry that leave the farm are just the raw material for making our food. The food processing industry turns this torrent of raw farm produce into chicken nuggets, milk shakes, school lunches, linguine Alfredo, and virtually every other thing we eat. Even though almost all the food we eat is processed in some way, processed food has a bit of an image problem. Processing is sometimes seen as a set of marketing tricks used to turn wholesome real
food into irresistible concoctions of starches, sugars, oils, and an unholy slew of chemical additives. And while it is true that a large and profitable segment of the industry does indeed churn out junk food,
food processing provides some important benefits to our society. Industrial food processing makes our foods clean and convenient. Unlike many people in the world, we don’t need to carefully sort through a bag of rice or beans to pick out pebbles or moldy seeds. Industrial machinery does that for us. It also removes bones, peels, grinds, juices, filters, sifts, dries, cans, freezes, pre-cooks, weighs, and vacuum-packs our food. All of this leaves us with a very convenient supply of food. Our food is not only the cheapest in human history, it takes the least time and effort to prepare for eating.
As with agriculture, economies of scale and industrial analysis have dramatically lowered the per unit cost of almost all food processing. Specialized machines, such as 100-horsepower extruders can make uniform food products quickly (try to make Cheerios or Pop Tarts at home by hand). Because the specialized processing machinery is very expensive, huge volumes of food must be processed in one place in order to justify the initial investment in equipment.
Distribution
After this mountain of industrial food is grown and processed, it must then be distributed to the hundreds of millions of homes where it will eaten. This is obviously a daunting logistical challenge. The average bite of food eaten in the US has traveled at least 1,300 miles. Generally, the farther food travels, the greater the number of people who have role in getting it to the table. When food is imported from another country (and an increasing percentage of our food is imported), the number of customs officials, inspectors, brokers, freight consolidators, and shippers involved is impressive.
There are certainly advantages to getting the food you need from nearby, but what are the benefits of an industrialized global food distribution system? The most obvious is that you can eat things that don’t grow where you live. That may include oranges, bananas, chocolate, coffee, salmon, avocados, and a range of other distant delicacies. Secondly, foods that do grow where you live might not be growing when you want to eat them. For many people in the Northern Hemisphere, apples in May, tomatoes in November, and spinach in August are foods that fall into this category.
A third advantage of shipping foods long distances is that they can be grown by the lowest-cost provider. For instance, large, highly mechanized farms in California have climate and soil conditions that are advantageous for growing carrots. A local grower with less-than-ideal soil and weather can’t compete on price with big California operations like Bolthouse Farms, which processes six million pounds of carrots a day. The economic advantages are so significant that one third of all the produce grown in the United States comes from California’s central valley.¹
In order to ship food 1,300 miles and still make money, the cost of both the food and the transportation has to be kept very low. Industrial-scale agriculture and food processing produce the low-cost food, and inexpensive fossil fuel keeps transportation costs down. The global food distribution system weaves together ocean cargo routes with automated ports. Free trade agreements that allow multinational companies global access to the lowest-cost food providers are essential to the economics of this system. So is sophisticated technology. From the farm where it was grown or from its port of entry, most food continues its journey in trucks. Customized computer programs match up extensive national highway systems with regional warehouses and link those warehouses to the retail stores.
To the average person, the colossal distribution web that binds them to the industrial food supply is largely invisible. Only when the food arrives on the shelves of our supermarkets or on the table at a local restaurant do we become aware of its existence.
The embrace of information technology is one of the defining characteristics of the industrial food system. Nowhere is this more evident than in food distribution. Bar code readers in the check-out aisle of supermarkets not only tell customers how much to pay, they tell store managers how much of what products have sold that week and what needs to be reordered. Store discount cards increasingly track consumer data, which allows food marketers to identify and influence shopping trends. When you hit your favorite pizza place on speed dial and they answer the phone knowing your name, address, and your preference for green olives, that’s information technology distributing your food. When the pizza arrives hot at your door in 30 minutes or less, that is the industrial food system providing you convenience.
Consumption
Ultimately, the most important step in any food’s journey takes place when it is eaten. Americans each eat about 2,000 pounds of food a year. So, when someone makes a New Year’s resolution to not eat a ton of food this year, it is not hyperbole. We now each eat about 200 pounds more food per year than we ate in 1980, so it’s not surprising that the pants feel a bit tight.²
How we consume food shapes how the entire food system is organized. For Americans, convenience rules. For example, Americans spend about 30 minutes a day preparing food, compared to an average of 52 minutes for people in other industrialized nations.³ The percentage of our food dollar spent on meals away from home nearly doubled from 1970 to 2000, and that trend is continuing.⁴ With estimates of nearly one in five meals being eaten in cars, it is not surprising that food companies are designing soup that fits into car cup holders and bacon and egg breakfasts that can be eaten with one hand while driving.
The final — and often ignored — step in food’s trek is as waste. The industrial food system is reasonably good at avoiding waste on the front end. Farmers, slaughterhouses, and processors have found many ways to make economic use of by-products that were previously thrown out. Packing house wastes are often used to feed animals, and the blood and bones remaining from slaughtering meat animals is turned into fertilizers and food for other animals. Where things get sloppy is on the retail end. Where things get really bad is where the food is meant to be consumed: our homes. Our food waste per person has nearly doubled since 1974. Astonishingly, as much as 40 percent of all food produced in the US is now wasted.⁵
Flaws in the Industrial Food System
Unless you live in the Amazon rain forest or a deserted lighthouse, you have probably heard some of the less-than-glowing reviews of the industrial food system. Some of these criticisms are essentially the flip side of what supporters of the predominate system consider to be strengths. For instance, the tremendous output per man-hour keeps food costs low, but it’s also a major cause of unemployment. The reliable consistency and uniformity of industrial fare benefits the consumer, but at the expense of lost flavor and variety.
Ultimately, the most damning judgment against the industrial food system is that it cannot be sustained. Critics state the obvious: complete dependence on non-renewable energy sources is not a recipe for long-term sustainability. Many go on to point out that industrial agriculture is also losing its topsoil far faster than it can be rebuilt. Actually, the average rate of soil erosion on large monoculture farms has declined since the 1970s and appears to have leveled off. While definitely an improvement, the rate of erosion is still about ten times greater than the rate of natural soil formation.⁶ This is hardly a strategy for a durable food system.
The lack of biological diversity is another significant problem for industrial agriculture. Most biologists agree that maintaining a large number of unique genetic possibilities is important to the sustainability of ecosystems in general and the food system in particular. The lack of diversity is present both on individual farms, where monocultures are the rule, and throughout the food system as a whole. The aggressive promotion of a few profitable hybrids and genetically modified seed varieties is leading to a widespread and permanent loss of traditional and heirloom varieties of food crops. It is estimated that over 90 percent of the historical genetic diversity of our food crops has been lost since the advent of industrial agriculture; some well-documented studies show that up to 98 percent of vegetable varieties in the US have been permanently lost in the past 100 years.⁷,⁸
Perhaps the most vexing concerns about the industrial food system relate to the nature of the food itself. The industrial food system generally does a much better job with quantity than with quality. This is especially true with nutrition. Overall, the industrial food system supplies far too much refined carbohydrates, fats, and salt, with far too little fruits, vegetables, and whole grains. This results in diets with too many easily absorbed calories, and with shortfalls of certain protective vitamins, minerals, and antioxidants, as well as fiber. This industrial diet has been blamed for sharp increases in the rates of obesity and diabetes.
A lot of ink and air time has been expended on these issues, but here’s a depressing summary:
•36 percent of American adults are obese. 69 percent are overweight.⁹
•Obesity raises annual medical costs by $2,741 (in 2005 dollars) per person.¹⁰
•In addition to medical costs, the epidemic of obesity also costs society in the form of more food, more clothes, more fuel, bigger furniture, lost work time and output, and weight control programs.
•The number of people diagnosed with diabetes has risen from 1.5 million in 1958 to 18.8 million in 2010, an increase of epidemic proportions. People with diagnosed diabetes have average medical expenses of about $13,700 per year.¹¹
•Mexico has now surpassed the US in per person soda consumption and has become the world’s fattest nation. They have passed a tax on soda to try to slow the avalanche of medical costs from obesity and diabetes.
Another (increasingly vocal) criticism of the industrial food system is leveled at the inhumane treatment of cattle, swine, and poultry in crowded feeding operations. A small group of animal rights activists initially called our attention to the way animals are treated in the CAFOs. As graphic images of crowded animals in factory farms reach more eyes, the number of people put off by the factory farms swells. Industrial meat producers have generally responded to this unease not with better living conditions for the animals, which would have significant costs for them, but rather with greater restriction of access to the CAFOs — so people can’t take more pictures.
Lastly, there are concerns that the global industrial food system is damaging the social and economic fabric of local communities. Some degree of autonomous control over the food supply is considered by many planners to be essential to the health and resiliency of local communities. The vast economic power of the global food corporations makes it difficult for small communities to have more than a passive consumer-oriented input into how they eat.
What Is the Take-Home (or Take-Out) Message?
We want our pizza delivered fast and hot. We see the industrial food system like a dazzling blind date. We are drawn to its obvious attributes, but the more we learn about it, the more we become aware of its flaws.
Can we have healthier food that is still cheap, appealing, and always available? Can we grow food in a way that is sustainable while holding on to the huge gains in productivity? Well, yes, and no. Some possible improvements are pretty obvious. Reducing the sugar and salt content in processed foods would be easy and relatively painless. More whole grains could be brought to market without changes in farming techniques because refined grains are, of course, made from whole grains.
Highly processed foods with 25 or more ingredients could be simplified. Foods targeted to children could be held to a higher nutritional standard. Shipping foods that are mostly water, such as fruits, vegetables, juices, and milk, long distances doesn’t make sense if those foods could be locally produced.
We have arrived at the point where we need to analyze the entire industrial food system, component by component. Then we can fully consider the merits and drawbacks of alternative approaches from an informed and pragmatic viewpoint. Only then we can begin assembling and testing hybrid food systems to find what best meets the often-conflicting needs of people and the planet.
For the first time in human history, overeating is a larger global threat to our health than hunger. As tedious as trying to lose weight may be, most of us would rather wake up with that problem than with the older one of not having enough to eat. It is time to offer up congratulations and a toast to those who have, over centuries of hard work, replaced hunger with plenty. It is likewise time to graduate to the new task of producing that plenty more sustainably, with greater justice, respect, and beauty. In short, with more grace.
This food is the gift of the whole universe — the earth, the sky, and much hard work.
May we live in a way that is worthy of this food.
May we transform our unskillful states of mind, especially that of greed.
May we eat only foods that nourish us and prevent illness.
May we accept this food for the realization of the way of understanding and love.
« THICH NHAT HANH »
2
Less of the Same?
The Promise of the Local Food System
The Local Food Movement
Widespread and growing disgruntlement with the industrial food system has begun to coalesce into a very loose-limbed movement that is dedicated to creating alternative ways of meeting our need for food. Especially in Europe, the US, Canada, Japan, and Australia, this dissatisfaction with the status quo is being expressed through the emergence of several locally focused food-distribution schemes. Sometimes local
is defined as foods grown, processed, and eaten within a somewhat arbitrary radius of perhaps 50 or 100 miles. Often, the term local food
simply describes food distributed directly from the producer to the consumer, rather than through a long-distance supply chain. Two of the most important and fastest growing elements of this local food movement are farmers markets and community supported agriculture (CSA).
Farmers Markets
Farmers markets are retail markets where farmers sell their produce directly to the consumers. This is hardly a new concept, but after a long gradual decline, farmers markets are experiencing an extraordinary renaissance. In 1994 there were 1,775 farmers markets in the US. By 2012 there were over four times that number. Farmers markets in the US typically have between 10 and 100 vendors. Most markets are held outdoors, once or twice a week during the peak harvest season. About 15 percent of the markets in cold weather areas continue to operate through the winter by going indoors.
Most farmers markets offer some minimally processed local foods, such as breads, cheeses, and jams, along with the fresh fruits, vegetables, and meats. Some markets also have locally made craft items. It is common to have some restrictions on what can be sold. For example, many markets prohibit reselling food that was bought elsewhere at wholesale, and some require that all items come from within a set distance from the market.
Community Supported Agriculture
Community supported agriculture is a newer idea for marketing farm produce. It began in Japan and Europe in the 1960s as a way of spreading the risk of farming between farmers and consumers. Cities were expanding, and prime agricultural land was being quickly lost to residential developments. Much of the original motivation of the community supported agriculture movement was to protect the farm belt around towns by shielding the farmers from some of the unpredictability of the real estate market. By the 1980s, the concept had taken root in North America, starting in the northeast and the Pacific coast.
The basic idea of the CSA is the formation of a partnership between the farmer and the consumer. Typically, consumers subscribe to buy a share in a farmer’s crop, thus assuring their access to fresh produce and sparing the farmer some of the risk and trouble of marketing. In a good year, consumers receive baskets bursting with produce. In years when conditions conspire to damage the crops (perhaps through drought, flooding, or freezing), consumers get baskets that are less bountiful, and so share any loss with the farmer.
Because the subscription payments are usually made before planting begins, the farmer can more accurately estimate how much of each crop to plant. The pre-sale of the crop provides the cash that farmers need for seeds and supplies at the beginning of the growing season. It also allows the farmers to concentrate on growing superior quality food with fewer worries about marketing during their busiest season.
There are dozens of variations on the community supported agriculture strategy. Many CSAs are joining together to offer customers a wider variety of food in their weekly baskets. For instance, a vegetable farm might combine their products with those from a dairy and egg farm, or a grass-fed beef farm. There is no doubt that the CSA phenomenon is spreading rapidly. However, there is no standardized definition of a CSA farm, nor is there a reliable means of counting them. Estimates of the number of CSA farms in the US in 2012 range from about 4,000 to about 6,000.
Core Beliefs
These two marketing schemes, farmers markets and CSAs, share a core set of beliefs that defines the local food movement. These beliefs fall roughly into four overlapping categories that describe the benefits of local food: nutritional, social, economic, and environmental.
Nutritional Benefits: There is nearly unanimous agreement within the local food movement that fresh, minimally processed food is healthier than highly processed food shipped in from afar. This opinion is generally supported by nutritional science. There is also widespread (but not unanimous) support within the local food movement for the idea that organically grown food is more nutritious than its conventionally grown counterpart. Mainstream nutrition science is somewhat less convinced on this point.
Social Benefits: The local food movement holds it as self-evident that face-to-face interaction between producers and consumers of food will strengthen community trust and cohesion. In addition, farmers markets supply opportunities for farmers to talk with other growers about agricultural problems that are specific to that area. Shoppers quickly realize the markets offer social possibilities beyond simply getting fresh food. People come